My legacy -- or lack of

When I think of upon the meaning of life, or at least the meaning of my life, the idea of building a legacy (children) isn't always up there as the pinnacle of things.  I'd probably say building a world changing invention like vapoorizor would be up there....

I know others say thats their goal -- to create a legacy [of wealth and of people] that generations can remember or trace back to.   Perhaps in tomorrows world, with everything recorded on the Internet the idea of descendents will be bit more interesting as you can really get to know them by looking at their facebook timeline.  When I think about my ancestors I can say I barely know anything and I suspect most people don't know more than a few sentences about anyone over 2-3 generations up the chain.  In fact most people probably don't care who great-great-grandpop was.

So the building of a legacy... why does it not interest me?   Is it because I'm selfish?  or is it because I'm not selfish and don't have so much pride in my own existence to feel the need to have it replicated into offspring?  I'm not sure -- at times I feel disconnected to society in this regard.

BTW as i type this I am watching the sun rise @ 530am -- an awesome/beautiful sight from my 25th story hotel room overlooking the seas -- now that is cool shit. 
Back to legacy -- I had asked a coworker why he wants to have kids.  Some people look at me when I ask this like I'm crazy, but seriously, I need to ask people "why do you want to have kids" and I ask them to explain it to me like I'm an alien.  Coworker had an interesting perspective, he said he was one of 5 kids, and he had good memories of the family, activities, brotherhood, and he could see how much his dad loved it, and even today when he talks to his dad he can see how much his dad loves seeing his kids etc.  So he wants to recreate that kind of loving and happy environment for himself.

It struck me -- as a real answer.  Not some bullshit I typically expect to hear or non-answers to the question.  

I had a good childhood, but somehow my memories are bit more scarred which makes me worry about the downside than strive to enjoy the upside of it all.  Its the same way one would look at playing craps, stock market, or having unprotected sex.  There is pleasure and pain in it and you have to hedge your risks because not playing is not a lot of fun.

1 more week of vacation left.  Yah :)